• Korean journal of applied entomology
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• v.35 no.3
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• pp.209-215
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• 1996

DNA polymorphisms were analyzed for 8 clones of the green peach aphid, Myzus persicae Sulzer, by random amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR). The insect has different host preferences and was even classified into two different species, M. persicae Sulzer and Myzus nicotinae Blackman by their morphological characters, but this point is still in arguement. To identify the differences between two types of the green peach aphid by RAPD-PCR, the template DNA was extracted from 4 clones each of tobacco-feeding and non-tobacco-feeding forms and one hundred primers of 10-nucleotideslong were tested in PCR. The amplified DNAs were analyzed by agarose gel electrophoresis. Eighty-three primers gave amplified DNA fragments with 1 to 22 in number and 500 to 20,000 base pairs in length, but no amplification was observed in the other 17 primers. The average number of fragment per each amplification was about 13. In the case of 82 out of 83 random primers, band patterns of amplified DNA were identical among 8 clones, even though some differences were noticed in the intensity of specific bands. Polymorphism was detected by only one primer within the tobacco-feeding forms, but not between the two host types. The results did not detect any relationship between RAPD polymorphism and their host preference.

• Korean journal of applied entomology
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• v.32 no.2
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• pp.218-221
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• 1993

Sensitivities of insecticides and their seasonal variation were investigated against Myzus persicae. Some aphicides such as malathion were not effective on Myzus persicae in Chinese cabbage field. Difference of seasonal sensitivity was from I time to 16 times.

• International Journal of Industrial Entomology and Biomaterials
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• v.17 no.2
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• pp.211-215
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• 2008

To select entomopathogenic fungi controlling aphids effectively, several isolates were screened against second instars of Myzus persicae nymphs in the glasshouse using conidia suspension at $1.0{\times}10^5$ conidia/ml. Among these isolates, SFB-205 conidia showed the highest insecticidal activity about 32.7% efficacy to M. persicae at 4 days after application in the glasshouse. The attachment of SFB-205 conidia on the surface of M. persicae nymphs, and germination and penetration were observed using scanning electron microscopy. SFB-205 was identified as Beauveria bassiana species through the comparison of 5.8 s rRNA genes. There were 24 polymorphisms between SFB-205 and the previously reported isolate, B. bassiana ATCC74040 using six kinds of primer combinations in amplified fragment length polymorphism (AFLP) analysis. The B. bassiana SFB-205 might be used as a practical biological control agent for the green peach aphid, M. persicae in the field.

• Korean journal of applied entomology
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• v.16 no.2 s.31
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• pp.93-100
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• 1977

This is the fist report on detailed aphid transnsmission studies of cruciferous virus in Korea, and experiments aimed to get basic informations for control of vectors. Aphid transmission of turnip mosaic virus prevalent on radish in the field was studied. Results obtained were as follows: 1. Myzus persicae, Lipaphis erysimi, Aphis gossypii and Aphis craccivora were found to transmit turnip mosaic virus. 2. The proper time for turnip mosaic virus transmission by Myzus persicae was 1 hour of fasting, 3 minutes for acquisition, and 1 minute for inoculation: Lipaphis erysimi was 2 hours for fasting, 5 minutes for acquisition, and 3 miuutes for inoculation: while Aphis gossypii needed 1hour for fasting, and 3 minutes for each of the acquisition and inoculation periods. 3. There was Po great difference in probing patterns between nonfasted and fasted aphids for 2 hours. All the fasted aphids began feeding after 4 minutes, 4. When Myzus persicae were transferred artificially at 1-2 minute intervals, the number of probes with aphids fasted for 2 hours was much greater than that of nonfasted aphids. Aphids fasted for 2 hours mainly transmitted the virus before 4 minutes, with an acquisition feeing period of less than 3 minutes

• Korean journal of applied entomology
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• v.5_6
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• pp.9-18
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• 1968

Morphological studios on the mouth parts of some aphids belonging to 5 sub-families and on the penetration of stylets into their host plants were carried out in order to find out possible relationship between mouth parts and capability of virus transmission. 1. There were no differences between the aphid species in general morphology of mouth parts. 2. Mouth parts could be observed in detail especially in Toxoptera citricidus and Chaitophorus chinensis. 3. Accessory salivary gland was larger than principal salivary gland in Toxoptera citricidus. 4. In 4 species, e. g. Chaitophorus chinensis, Myzus persicae, Aphis craccivora, Toxoptem citricidus, the stylets were usually inserted in plant tissues intercellularly and reached phloem, however, in Lachnus tropicalis only intracellularly and in Eriosoma clemalis more frequently intracellularly. 5. The stylets tracks of Eriosoma clemalis, Lachnus tropicalis and Myzus persicae were clearly visible but not in Toxoptera citricidus, Chaitophorus chinensis and Aphis craccivora. The tracks were stained with yellowish brown or red brown. 6. Saliva was seceted between the cell walls in most species and some substances in saliva seem to cause loosend cell walls. 7. The penetration of the stylets might cause physiological disturbance to host plants and could make the host plants susceptible to the plant diseases.

• Korean journal of applied entomology
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• v.44 no.3 s.140
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• pp.213-217
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• 2005

Adult development and fecundity of the green peach aphid, Myzus persicae $S\H{u}lzer$, were studied at $15{\sim}32.5^{\circ}C$ with $60{\sim}70%$ RH under 16L:8D and the results were put together to build a life table. The longevity shortened as temperatures rose at and below $25^{\circ}C$ whereas it remained relatively constant at $27.5^{\circ}C$. Total fecundity was not significantly different at all temperatures except at $30^{\circ}C$. Daily fecundity gradually increased from $15\;to\;22.5^{\circ}C$. It was 5.1 at $25^{\circ}C$ and as temperatures either went down or up, it decreased to 2.8 at both $15^{\circ}C\;and\;30^{\circ}C$. Fecundity model built from total fecundity at various temperatures suggests that $18.3^{\circ}C$ was the optimum temperature for the maximum progeny of 51. Net reproduction rate RO was highest of 36.5 at $27.5^{\circ}C$. The intrinsic rate of increase per day $r_m$ and the finite rate of increase per day $\lambda$ were highest of 0.4 and 1.6, respectively and the doubling time Dt was shortest of 1.6. Constructed life table suggests that the optimum temperature for adult development for the green peach aphid was $27.5^{\circ}C$ at which the mean generation time was 8.1.

• Korean journal of applied entomology
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• v.28 no.1
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• pp.32-36
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• 1989

The joint toxic action of mixtures of cypermethrin or pirimicarb with one of other insecticides (acephate, cypermethrin, demeton-S-methyl and pirimicarb) on the cypermethrin or picimicarb-selected green peach aphid (Myzus persicae Sulzer)was investigated. The responses depended on the choice and ratios of insecticide combination. In the cypermethrin-selected strain bioas-say, mixtures of test insecticides showed no synergistic effect. On the other hand, the maxi-mum synergistic effects for the pirimicarb-selected strain were obtained at the 8 : 2 ratio of pirimicarb and demeton-S-methyl exhibited antagonistic effect.

• Korean journal of applied entomology
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• v.28 no.1
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• pp.23-27
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• 1989

The green peach aphid(Myzus pericae Sulzer) was selected over 20 generations with cypermethrin and pirmicarb, respectively. The resulting resistant strains were tested to inverting-ate the development of insecticide resistance and cross-resistance to some insecticides in the laboratory. The development of insecticide resistance against green peach aphid at the 20th selected generation was greatly varied with the insecticides: 20.5 fold for cypermethrin and 3.2 fold for pirimicarb compared with the parent strain. The cypermethrin selected strain exhibited cross resistance to acephate and pirimicarb, and pirimicarb selected strain to acephate and cypermethrin, respectively. Demeton-S-methyl, however, has not been shown cross-resistance by the selected strains.

• Korean journal of applied entomology
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• v.50 no.1
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• pp.21-27
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• 2011

Twenty-five species of pests had occurred at orchards of Japanese Apricot, Prunus mume Siebold & Zucc., in Hadong and Jinju (Gyeongsangnam-do province) from 2005 to 2007. Rhopalosiphum rufiabdominale (Sasaki), Singapora shinshana M., Tetranychus viennensis Zacher, and Synanthedon hector B. occurred as major pests and Anthonomus persicae sp. nov., Grapholita molesta (Busk), Spodoptera litura F., and Myzus persicae (Sulzer) as a sporadic pests. The population of S. shinshana had increased continuously during the season, from late April to late October. The population of T. viennensis occurred early May, reached the highest peak in late June to early July, and then declined with worsening consequences of nutritional conditions in the apricot leaves. A. persicae was observed to occur before breaking flower-bud of apricot and emerged adults were found in April to early May.

• The Korean Journal of Mycology
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• v.26 no.3 s.86
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• pp.399-402
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• 1998

An entomopathogenic fungus, Zoophthora radicans, was found causing epizootics in populations of the green peach aphid, Myzus persicae, on March 27, 1998 at Seongju Gun, Kyungbuk Province in Korea. Anamorhic characteristics of the fungus were described using light and scanning electron microscopy. Distinguishing characteristics of Z. radicans is formation of capilliconidia on a single slender secondary conidiophore.